// 设置响应头的中间件
module.exports = async (ctx, next) => {
  const contentType = "application/json; charset=utf-8"
  ctx.set("Content-Type", contentType)
  ctx.set("Access-Control-Allow-Origin", "*")
  ctx.set("Access-Control-Allow-Methods", "OPTIONS, GET, PUT, POST, DELETE")
  // ctx.response.body = '{"success":true}'
  await next()
}